More verbose err, and setting up /usr/bin /usr/lib to env paths.

src/nyan_system.rs

@@ -227,6 +227,31 @@ pub fn prepare_env() -> Result<(), ExecCommandError> {
     Ok(())
 }
 
+///
+///  MUST be done before spawning any threads or async runtimes
+pub fn set_env_vars_unsafe() -> () {
+    use std::env;
+    // 1. Define your custom paths
+    let custom_bin = "/usr/bin";
+    let custom_lib = "/usr/lib";
+
+    // 2. Retrieve existing paths to append/prepend (optional but recommended)
+    let existing_path = env::var("PATH").unwrap_or_else(|_| String::new());
+    let existing_ld_path = env::var("LD_LIBRARY_PATH").unwrap_or_else(|_| String::new());
+
+    // 3. Construct new path strings
+    // Prepend custom paths so they take precedence
+    let new_path = format!("{}:{}", custom_bin, existing_path);
+    let new_ld_path = format!("{}:{}", custom_lib, existing_ld_path);
+
+    // 4. Set environment variables (UNSAFE in Rust 2024+)
+    // MUST be done before spawning any threads or async runtimes
+    unsafe {
+        env::set_var("PATH", new_path);
+        env::set_var("LD_LIBRARY_PATH", new_ld_path);
+    }
+}
+
 // # Mount the real root filesystem
 pub fn mount_bee_root(mount_point: &str, dev_name: &str) -> Result<(), ExecCommandError> {
     exec_command("mount", &vec!["-o", "ro", dev_name, mount_point])?;